KB ALERT: Winchester or a similar, harder primer are the only safe ones to use in a Lee Progressive loader-be sure you use the correct type of primers with a Lee Progressive system. rI use CCI primers because they are a bit faster burning than Winchester and that’s handy for subsonic loads to help ensure you maximize ignition to help cycle the action. The bolt locks open after the last round clears.Īccurate 1680 is tough to find sometimes but the powder density matches the case capacity very nicely in the BLK. I’m using 220gr Sierra Match HPBT for the projectiles and AA1680 for powder. About 50 rounds of this recipe fired through my 16″ rifle at distances up to 200 yards to punch paper and plink. This is the recipe I use for supersonic loads for my Model 1 300 Blackout Carbine. The BLK was designed to run suppressed too- so if real quiet os your bag and you I enjoy some closer range shooting ( effective hunting range is about 100m). 5.56 ‘heavy’ projectiles weigh in at 75-80gr. That’s a mere 3.4 times heavier than common 62gr 5.56 ammo. The subsonic loads are intriguing: who wouldn’t want to send a 220gr Sierra HPBT for a big, heavy projectile to create high performance at subsonic fps. The BLK was designed to accommodate both supersonic and subsonic ammo without any tuning or performance headaches.
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